Window lock



March 6, 1934. L. N. HOFFMAN WINDOW LOCK Filed Feb. 15, 19,52

INVENTOR. L aural: ce /Vflo ffhzan 9 A TTORNE Y5 Patented Mar. 6, 1 934UNITED STATES PATENT OFFICE WINDOW LOCK Laurence N. Hoffman, Shelby,Ohio, assignor to The Shelby Metal Products Company. Shelby, Ohio, a.corporation of Ohio Application February 13, 1932, Serial No. 592,765 1Claim. (01. 292-242) hereinafter fully described and particularlypointed out in the claims.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention may be used.

In said annexed drawing:

Fig. 1 is a fragmentary perspective view of a window constructionshowing the locking device constructed according to the principle of myinvention in position thereon; Fig. 2 is a transverse sectional view ofFig. 1; Fig. 3 is an enlarged sectional view of my locking device; Fig.4 is a section taken substantially on line 4-4 of Fig. 3.

Referring more particularly to the drawing, in Fig. 1 thereof I haveshown the usual window construction consisting of the lower frame 1 andthe upper frame 2. These two frames, it is obvious, are movable in adirectionparallel to each other, and it is the purpose of the presentinvention to provide a means which will prevent such movement in onedirection while permitting it in the other.

My locking device, therefore, which is shown in attached position uponthe upper horizontal window frame member 3, consists of a base plate 4having the upwardly extending bifurcated projections 5 and 6. On eachend of the base plate 4 are the downwardly depending flanges 7 and 8.The flange '7 has an inwardly projecting pointed lug 9 which is adaptedto engage with one side of the window frame 3. A set screw 10 ispositioned in the flange 8 and has a relatively sharp point 11 forengagement with the opposite side of the window frame. The shoulderportion 11 between the sharp point 11 and the thread portion of thescrew 10, is slightly tapered. The purpose of such a taper is to preventan excessive imprint or marring into the wood of the window frame, suchas would be caused by sharp shoulder at this point. The slot 12 in thehead of the screw 10 is made of sufficient size in order that a coin maybe inserted therein whereby the locking device may be readily installedor removed in a satisfactory manner without necessitating the use of anyparticular tool.

A lever arm 13 is pivotally mounted between the flanges 5 and 6-by meansof lateral extensions extending through the holes 14 in such flanges.

The outer end of the lever arm 13 is bent back upon itself and curvedinto the U-shaped form 15. A rubber insert 16 is adapted to be clampedsecurely within the U-shaped portion 15. It will be seen that the outersurface of the rubber insert 95 16 is slightly corrugated or roughenedand extends beyond the metallic portions of the lever arm 13.

Referring to Fig. 2, it will be seen that the lever arm 13 is adapted tomake contact with the win- 7 dow frame 2 by virtue of the grippingaction of the rubber insert 16. Further attempted upward movement of theframe 1 or downward movement of the frame 2 sets up an increased wedgingaction through the lever arm 13 which is sufficient to prevent furthermovement of the window frames with respect to each other.

The outwardly extending end 17 of the lever arm 13 is inclined upwardlyand serves as an operating lever for disengaging the locking device. Aflat spring 18 is clamped to the base plate 4 and bears against theunder side of the upwardly curved portion 1'7 of the lever arm 13. Thepressure of the spring 18, therefore, tends to force the lever arm 13toward its downward position as 95 shown in Fig. 3.

In cases where it is desirable to render the locking device inoperative,the portion 17 may be depressed to a point below the holes 19 in theside flanges 5 and 6. A nail, pin, or match may then be inserted throughthe holes 19, and will serve as a means for retaining the lever arm 13in inoperative position, substantially as indicated by the dotted linesin Fig. 2.

The above described device is one which may be quickly and economicallymanufactured, since sheet metal stock may be used both for the baseplate and locking arm. It produces a locking action automaticallyregardless of whether the window is opened or closed. Furthermore, dueto the novel form of construction whereby the rubber insert is clampedin position upon the device, it may be used as a means for eliminatingwindow rattles. Such clamping construction tends to slightly extrude therubber insert and to maintain the resilient qualities of the rubber.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means upwardly and its other endreversely bent into nearly cylindrical form, a rubber bearing membercompressibly held in said cylindricaliy i'ormed portion, and laterallyprojecting lugs on said strip, said lugs extending into said aperturesto pivotally mount said locking member between said flanges.

LAURENCE N. HOFFMAN.

